Cooper Instruments & Systems DPG 100 Digital Pressure Test Gage - Manual (Page 12)

4.2 Required Pressures
In order to re-calibrate the instrument, you must have a precision pressure standard that can produce the zero-
scale, half-scale and full-scale pressures for the instrument's range. Examine the table below to determine the three
pressures needed to calibrate your instrument. For example, if your instrument has a range of 100 PSIG, your
pressure standard must be able to accurately produce pressures of 0 PSI, 50 PSI and 100 PSI.
All instruments are calibrated in PSI regardless of the field-selected engineering units. However, if the instrument
displays the word" SPCL" (special) when it powers up, it has been specially calibrated to another engineering unit.
In that case, the serial number tag on the top of the instrument will indicate the engineering units that will be used
for re-calibration.
Table 3: Required Pressures (all in PSI)
Pressure
Range Calibration Point O
(zero-scale pressure) Calibration Point 1 (half-
scale pressure) Calibration Point 2
(full-scale pressure)
1 0 0.5 1
5 0 2.5 5
15 0 7.5 15
30 0 15 30
50 0 25 50
100 0 50 100
200 0 100 200
300 0 150 300
500 0 250 500
750 0 375 750
1K 0 500 1000
1.5K 0 750 1500
2K 0 1000 2000
3K 0 1500 3000
5K 0 2500 5000
7.5K 0 3750 7500
10K 0 5000 10000
4.3 Calibration Procedure
Make certain the instrument is turned off.
Open up the instrument by removing the center screw on the back. Next, remove the front face panel. Take care
not to break the wires extending from the sensor to the electronics. As indicated in Section 4.4, move the mode
jumper from the "park" position to the "calibration" position.
Hold the [On/Off] button, then press the [Clear] button. The Zero Hi/lo
display will momentarily read " OP-1”
The display will begin to alternately flash between the pressure required for calibration point #0 (for example "0
00.0') and “- ---". If you wish to abandon the calibration procedure, press the [On/Off] button to turn the unit off.
Otherwise...
Apply the indicated pressure to the instrument. Press [Clear] until "-P-"is
displayed, indicating that the reading is being stored.
Next, the display will begin to alternately flash between the pressure required for calibration point #1 (for example,
"050.0”') and ” - ---".
DPG 100 9 Rev Feb 2001