Maintenance; Clean The Unit; Replace The Batteries; Calibration - GE Druck DPI 841 User Manual

Maintenance

This section gives procedures to maintain the unit in a
good condition. Return the instrument to the
manufacturer or an approved service agent for all repairs.
Do not dispose of this product as household waste. Use an
approved organisation that collects and/or recycles waste
electrical and electronic equipment.
For more information, contact one of these:
• our customer service department:
(Contact us at www.gesensing.com)
• your local government office.
Maintenance - Clean the unit
Clean the case with a moist, lint-free cloth and a weak
detergent. Do not use solvents or abrasive materials.
Maintenance - Replace the batteries
To replace the batteries, refer to B1. Then re-attach the
cover.
Make sure that the time and date are correct. The
calibration facility uses the date to give service and
calibration messages.
All the other configuration options stay in memory.

Calibration

Note: GE can provide a calibration service that is traceable
to international standards.
We recommend that you return the instrument to the
manufacturer or an approved service agent for
calibration.
If you use an alternative calibration facility, make sure that
it uses these standards.
Calibration - Before you start
To do an accurate calibration, you must have:
• the calibration equipment specified in Table 8.
• a stable temperature environment: 70 ± 2°F (21 ± 1°C)
Table 8: Calibration equipment
Function Calibration equipment
(ppm = parts per million)
Hz 1) Frequency meter
Total error: 7 ppm or better
Resolution: 8 digits (minimum)
2) Signal generator
Pressure UPM only. Refer to the user manual for the IDOS
UPM.
mA mA calibrator.
Accuracy: Refer to Table 12.
Amplitude (V) 1) Frequency meter
Total error: 7 ppm or better
Resolution: 8 digits (minimum)
2) Digital volt meter (DVM)
Before you start the calibration, make sure that the time
and date on the instrument are correct (Table 1).
10
- [EN] English
B1
Calibration - Procedures (Hz - input/output)
Selection sequence:
➤ ➤
Select Task (Table 2)
Display: Enter
1 2
Calibration PIN
▲
▼
+
■ ■
Factory PIN = 4321
Table 9: Calibration options
Options Description
Hz To calibrate the input or output frequency.
... Amplitude. To select and calibrate the output
amplitude for the Square Wave and then the
Sine/Triangular Wave.
IDOS ... UMM only. To calibrate the specified IDOS UMM.
Refer to the user manual for the IDOS UMM.
mA DPI 842 only. To calibrate the mA input.
Calibration Due: To set the date of the next
calibration for the instrument.
After the specified calibration date, there is a
warning message. There is a selection box to stop
the warning.
To change the calibration PIN (Personal
Identification Number).
When you select a channel, the display shows the
applicable instructions to complete the calibration.
When the calibration is complete, select Calibration Due
and set the new calibration date for the instrument.
1. Connect the instrument to the calibration equipment
(Figure 1).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Set up the equipment with these conditions:
Frequency meter: Gate time = one second
Signal generator: Output = 10V, unipolar,
square wave
Frequency = 990 Hz
DPI 841/842: Input units = Hz (Table 4)
Input trigger level = 5V (Table 4)
4. Use the calibration menu (Table 9) to do the calibration.
The display shows the applicable instructions to
complete the calibration.
➤
Set Up (Table 1) Calibration
Menu:
3 4
Select Channel
▲
▼
(Table 9)
K395 Issue 3
➤
.
5