Dimensional Gaging

Precision Devices, Inc. INDI-AC Dimensional Gaging Systems

The precision gaging amplifier (PGA) is a solid state, compact, and easy to use unit for obtaining dimensional gaging measurements. The PGA is used in conjunction with a stationary gage head where the part to be measured is placed under the gage head and manually moved to make the measurement. The amplifier applications include surface plate work, run out, height gage indicator, size variation, and set-up verification.

INDI-AC Dimensional Gaging System

For ease of operation, a visual indication can quickly be obtained by setting measurement limits for the LEDs located across the top of the unit. The LEDs limits can be set to determine whether a part is within tolerance, close to the limits set, or out of the tolerance range. The PGA utilizes a large display and menu driven software that is both self-explanatory and prompts the user through set-up and measurement screens. Additionally, rear panel ports provide both serial data and analog voltage outputs for driving auxiliary devices.

The PGA amplifier has many features and functions that allow configuration of the amplifier and display of the measurement data in different formats depending upon the application. These features not only make the amplifier easy to use but provide excellent resolution for precise measurements.


  • 240 x 64 pixel graphical LCD display.
  • Software adjustable display contrast settings.
  • Concurrent display of bar graph, numerical value, head (transducer) configuration, range, etc.
  • Selection of displayed values in inches or millimeters (mm).

Transducer Inputs

  • Single channel (PGA-210) or Dual channel (PGA-220) versions.
  • LVDT-based gage heads. (See Optional Accessories Available for models)
  • Gage head maximum range: ± 0.02 inches (± 0.5 mm)

Data Functions

  • Reads heads A, B or both on PGA-220. Head A only on PGA-210.
  • Independent polarity configuration for head(s).
  • Display of ACTUAL, MIN, MAX, FIM (full indicator movement) or AVERAGE readings. FIM may be referred to as TIR (total indicated reading).
  • Single key zeroing of ACTUAL head readings.
  • Single key clearing of MIN, MAX, FIM and AVERAGE data.

Other Functions

  • Calibration wizard for electronically calibrating each gage head using stepped height changes.
  • Calibration wizard for calibrating the analog output.
  • Storage of all settings for up to four users or part configurations.

Optional Accessories Available

A typical gaging system consists of the PGA amplifier, a height stand, gage head. If these accessories are needed to set up your system, your representative at Precision Devices should be contacted. The following accessories are available for your system:

  • Stylus Tips (for T-425)
  • T-425 LVDT Gage Head (cables are attached)
  • T-504A Cartridge Gage
  • Gage Stand - 18 inch, 24 inch or 36 inch heights
  • Power cord for 220-250 volts, 50 Hz.
  • Analog Meter

Stylus Tips (For T-425): CPTK-A Tip Kit contains six (6) tips

1/8" Dia
CPTK-A Tip CP-321-2XA
1/16" Dia.
Carbide, 2X lg
1/16" Dia
CPTK-A Tip CP-321-Z
1/16" Dia
Carbide, Z form
1/16" Dia 
Sapphired Ball
CPTK-A Tip CP-322
1/32" Dia

Model T-425 Gage Head

Model T-425 Gage Head
Gage Tip Tip Length "A" Clearance Length "B" Gaging Force Gaging Range
1X (Std)
0 to 0.5g
0 to 0.3g
± 0.020"
± 0.040"

Model T-504A Cartridge Gage

Model T-504A Cartidge Gage
Gage Tip Gaging Force Gaging Range
5/32" Dia. Carbide Tip with #4-48 male thread 51g (at null position) 0.040"

Height Stands

Height Stand GS-2010
Height Stand GS-P-2412
Height Stand S-1311-S3
Part Number Description
6787-FA GS-2010 18” Height Stand (Ref. 71001194)
Base dimensions: 6.2” x 5.0” x2.5”
(159 mm x 127 mm x 64 mm)
Vertical capacity: 20” (508 mm)
Crossarm type: Rotating
Crossarm adjustment: 10” (254 mm)
Overall height: 19” (483 mm)
Weight: 14.5 lbs (6.6 kg)
4650-FA GS-P-2412 24” Height Stand (Ref. 71001199)
Base dimensions: 7.0” x 6.0” x 3.0”
(178 mm X 152 mm X 76 mm)
Vertical capacity: 24” (610 mm)
Crossarm type: Positive Drive
Crossarm adjustment: 12” (304 mm)
Weight: 30 lbs. (13.6 kg)
5178-FA 36” S-1311-S3 Special Height Stand
(Ref. 70156938)
Same specification as the GS-GS-P-2412 above except with a height of 36”

PGA Specifications

Parameter Specification
Range Settings:
Bar Graph and Analog Output inches mm
± 0.00002 ± 0.0005
± 0.0001  ± 0.0025
± 0.0002 ± 0.005
± 0.001 ± 0.025
± 0.002 ± 0.05
± 0.01 ± 0.25
± 0.02 ± 0.5
Numerical Display up to ± 0.04 ± 0.9999
Output Resolution:
Bar Graph Display 0.83% of selected range
Analog Output 0.024% of the selected range
Numerical Display 0.000, 001 inch (0.000, 01 mm)
Bar Graph Display Output: Nominal ± 100% proportional to gage head input
Analog Output: Nominal ± 5 volt proportional to gage head input
Limit Indicator Outputs:
Indicators (LED) Out of Range - + and – Red
Caution - + and – Yellow
Good - Green
Range Limit Settings Independent + and –
Adjustable Cautionary Settings Percentage of out of range settings
RS232 Output:
Output Displayed numerical value
Baud Rate Settings 300, 600, 1200, 2400, 9600, 19200, or 38400
Parity Settings NONE, EVEN, ODD
Line Termination Settings NONE, CR, LF, or CR + LF (CR = carriage return, LF = line feed)
Line Labeling Settings NONE, UNITS, FUNCTION, or BOTH
Hardware Handshake ENABLE or DISABLE
Power Requirements:
Amplifier Input 5 volts DC at 2.0 amperes
Power Pack Output 5 volts DC at 2.5 amperes
Power Pack Input 100 - 250 volts AC at 0.4 amps, 47-63 Hz
Operating Temperature Range 50° - 90° F (10° – 32° C)
Storage Temperature Range 30° - 110° F (-1° – 43° C)
Relative Humidity 10% - 90% non-condensing
Power Requirements:
Amplifier Input 5 volts DC at 2.0 amperes
Power Pack Output 5 volts DC at 2.5 amperes
Power Pack Input 100 - 250 volts AC at 0.4 amps, 47-63 Hz
(excluding handle)
9.25" x 6.25" x 2.5" (L x W x D)
23.5 cm x 15.9 cm x 6.4 cm
Weight 4 lbs. (1.8 kg)

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