7750i Air Data Test Set

The Model 7750i ADTS provides high performance measurement and control of all air data parameters.

 

  • High accuracy, RVSM compliant
  • Ideal for ATE systems
  • Accuracy to ± 2 feet, 0.03 knots
  • True differential sensor for airspeed
  • Control stability to 0.00032 inHg
  • One year calibration interval
  • Variety of ranges available for rotary and fixed wing aircraft

The Model 7750i Air Data Test Set represents the latest generation Air Data Test Set (ADTS), incorporating a unique quartz sensor having unequalled precision and long term stability with the latest pressure control technology. The Model 7750i ADTS provides high performance measurement and control of all air data parameters.
The Model 7750i is a laboratory ADTS for calibrating a wide variety of avionics instrumentation such as altimeters, airspeed indicators, rate of climb meters, Mach meters, air data computers and engine-based control systems that rely on accurate control and measurement of pressure. The 7750i can be used to calibrate devices that are required to meet the Reduced Vertical Separation Minimal (RVSM) requirements, controlling altitude to within two feet (better than 0.003 in Hg) at sea level. Additionally, the 7750i provides precision rate control for both altitude and airspeed.
The Model 7750i is ideal for use in Automatic Test Equipment (ATE) systems. The seven-inch height (4U) allows easy integration into comprehensive test systems. Additionally, an IEEE-488 interface is provided for PC-based control. The 7750i can be set to emulate previous generation ADTS (Model 6610), eliminating the need to alter existing software.

Automatic go to ground

Upon selecting the go to ground command, the 7750i safely controls the pressure to the current, local barometric pressure. The user can then disconnect the device under test (DUT) without exposing sensitive instruments to a potential pressure transient or shock.

Leak test mode

A separate mode is provided for performing leak checks prior to beginning an actual calibration.

Protecting the device under test

In order to protect the DUT, the operator can program high and low limit settings for:
  • Altitude
  • Airspeed
  • Rate of climb
  • Mach
  • Negative Qc
  • ARINC 565 envelope

Automatic volume characterization

The 7750i automatically tunes the controller into external volumes ranging from 80 to 1000 cubic centimeters (5 to 60 cubic inches). This allows a large degree of flexibility for the configuration of the test system and the type of aircraft and components to be tested. For component manufacturers, a large number of devices can be tested simultaneously on a single manifold.

Automatic zeroing

As with any instrument, regular zeroing is suggested to achieve maximum performance. This task is now automated and can be performed at the push of a button, or over the PC interfaces. The 7750i incorporates the vacuum sensor onboard; no separate or external vacuum gauges or sensors are required. In addition, only one vacuum pump is required to operate and zero the 7750i ADTS. Zeroing is performed in 30 to 45 minutes using the specified vacuum pump.

Avionics and pressure units

The Model 7750i displays the common avionics units including feet and meters for altitude, calibrated airspeed in knots, km/hr, and Mach with corresponding rate displays for each unit per minute. It can also display pressure units.

High performance for fixed-wing or rotary aircraft

Although the standard configuration offered is a Ps range of 32 in Hg and a Qc range of 68 in Hg, we also offer custom ranges. For example, for exclusive testing of rotary aircraft, a Qc range of 32 in Hg can be provided, increasing performance in the lower airspeed ranges. For other custom ranges please consult factory.

 

 

 

Specifications

Automatic Go to Ground Upon selecting the go to ground command, the 7750i safely controls the pressure to the current, local barometric pressure. The user can then disconnect the device under test (DUT) without exposing sensitive instruments to a potential pressure transient or shock.
Leak Test Mode A separate mode is provided for performing leak checks prior to beginning an actual calibration.
Protecting the Device Under Test In order to protect the DUT, the operator can program high and low limit settings for:
  • Altitude
  • Airspeed
  • Rate of climb
  • Mach
  • Negative Qc
  • ARINC 565 envelope
Automatic Volume Characterization The 7750i automatically tunes the controller into external volumes ranging from 5 to 60 cubic inches (80 to 1000 cc). This allows a large degree of flexibility for the configuration of the test system and the type of aircraft and components to be tested. For component manufacturers, a large number of devices can be tested simultaneously on a single manifold.
Automatic Zeroing As with any instrument, regular zeroing is suggested to achieve maximum performance. This task is now automated and can be performed at the push of a button, or over the PC interfaces. The 7750i incorporates the vacuum sensor onboard; no separate or external vacuum gauges or sensors are required. In addition, only one vacuum pump is required to operate and zero the 7750i ADTS. Zeroing is performed in 30 to 45 minutes using the specificed vacuum pump.
Avionics and Pressure Units The Model 7750i displays the common avionics units including feet and meters for altitude, calibrated airspeed in knots, km/hr, and Mach with corresponding rate displays for each unit per minute. It can also display pressure units.

Modes

Precision From 25% to 100% of FS: 0.005% of reading below 25% FS: 0.005% of 25% FS Precision is defined as the combined effect of linearity, repeatability and hysteresis throughout the operating temperature range. Some manufacturers use the word “Accuracy” in place of “Precision,” however the meaning is identical.
Stability Absolute Over 3 months: 0.0019% RDG/3 months Over 1 year: 0.0075% RDG/yearDifferential Over 3 months: 0.0019% RDG/3 months Over 1 year: 0.0075% RDG/year
Zeroing vacuum sensor Absolute 0.001% FSDifferential N/A
Control stability Absolute ±10 mTorr (1.33 Pa) @ 100 mTorrDifferential 0.001% FS
Control low limit Absolute 0.3 in Hg abs. (10 mbar a)Differential 0 in Hg in - Qc mode/0.3 inHg abs. in Pt modeRequires vacuum pump to control 0 psig, or the vent mode can be used to obtain 0 psig.
Zero Drift Absolute <0.004% FS / 24 hrDifferential <0.004% FS / 24 hr
Rate of climb Absolute 0 to 50,000 ft/minDifferential N/A
Rate of climb tolerance Absolute 1% of commanded to 50,000 ftDifferential N/A
Standard load volume Absolute 5 to 60 in (80 to 1,000 cc’s)Differential 5 to 60 in (80 to 1,000 cc’s)
Mach Absolute N/ADifferential 0 to 10.000Limits can be set to prevent excessive mach.
Total Uncertainty (Aeronautical Units) Absolute 32 in Hg a Sea level ±2ft 30,000 ±2 ft 60,000 ±7 ft40 in Hg a Sea level ±2 ft 30,000 ±3 ft 60,000 ±8 ftDifferential32 in Hg D 50 ±0.1 knots 100 ±0.05 knots 250 ±0.02 knots 68 in Hg D 50 ±0.2 knots 250 ±0.04 knots 500 ±0.02 knots 1,000 ±0.02 knots
Total Uncertainty (Engineering Units) Absolute 32 in Hg a 32 ±0.0030 30 ±0.0025 in Hg 15 ±0.0013 in Hg 5 ±0.0008 in Hg 40 in Hg a 40 ±0.0037 inHg 30 ±0.0026 in Hg 15 ±0.0014 in Hg 5 ±0.0009 in Hg Differential 32 in Hg D 0.5 ±0.0005 in Hg 16 ±0.0013 in Hg 32 ±0.0026 in Hg 68 in Hg D 0.5 ±0.001 in Hg 16 ±0.0016 in Hg 32 ±0.0027 in Hg 68 ±0.0055 in Hg

High Performance for Fixed-Wing or Rotary Aircraft

Although the standard configuration offered is a Ps range of 32 in Hg and a Qc range of 68 in Hg, we also offer custom ranges. For example, for exclusive testing of rotary aircraft, a Qc range of 32 in Hg can be provided, increasing performance in the lower airspeed ranges. For other custom ranges please consult factory.
7750i-802 Ranges Ps: 32 Qc: 68
77508-803 Ranges Ps: 40 Qc: 68
7750i-804 Ranges Ps: 32 Qc: 32
7750i-805 Ranges Ps: 40 Qc: 32

Display

Display TFT Active Matrix Color, 6.4 inch
Display Resolution 1 ft, 0.1 m, 0.1 kn/hr, 0.00001 Mach
Units Altitude: ft, meters Airspeed: knots, km/hr, Mach Pressure: Engineering Units: inHg at 0°C and 60°F, kPa, bar, psi, inH2O at 4 °C, and 25 °C, kg/cm2, mmHg at 0°C, cmHg at 0°C, and cmH2O at 4°C & four user defined linear units of measure. Aeronautical Units: feet, meters, knots, km/h, Mach

Control

Rate Control Indication RoC_Rate of climb in all above units RtAS_Rate of airspeed in Knots or km/hr
Total Uncertainty Expression 2 Sigma
Ps/32 inHg FS RSS of 0.0091% of Reading and 0.0008 inHg
Ps/40 inHg FS RSS of 0.0091% of Reading and 0.0009 inHg
Qc/32 inHg FS RSS of 0.0091% of Reading and 0.0007 inHg
Qc/68 inHg FS RSS of 0.0091% of Reading and 0.0012 inHg

Options

Options
  • Lines and fittings kit (supply and test lines) part number 7750-104
  • Vacuum pump_85 liter/minute capacity with auto-vent valve
  • Filter and muffler
  • National Instruments LabVIEW™ driver
  • ISO 17025 accredited calibration certificate

General

Electrical Power 90 to 260 VAC, 50 to 400 Hz, 150W max
Temperature Warmup time: 3 hours Operating temperature: 18°C to 36°C (64 to 97 F) Storage temperature: -20°C to 70°C (-4°F to 158°F)
Humidity Operating humidity: 20% to 75% RH, non-condensing Storage humidity: 5% to 95%, non-condensing
Pressure Medium High purity nitrogen or dry, clean air
Calibration One year interval is recommended. Use of primary standard such as the Model 2468 Pitot Static Gas Piston Gauge is recommended.
Digital Interface IEEE-488.2 RS232 Model 6610 emulation mode SCPI syntax
Pneumatic Connections 1/4 in FNPT on all ports. Adapters provided for AN6 and AN4
Weight and Dimensions (h x w x d) Weight: 45 lb (20 kg) Size: 7 in x 16.5 in x 19 in (17.8 cm x 41.9 cm x 48.3 cm)
Supply Pressure 60 psi +/- 5 psi (4 bar +/- 0.5 bar)
Supply Vacuum Minimum 50 liters per minute with auto-vent valve. Ultimate vacuum less than 1 mtorr
 

 

Model Name

Description

7750i Laboratory Air Data Test Set
 

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