Modeles 4370 UR1800 Recorder Instruction Manual

11.5 Calibration
IM 4H3B1-01E
It is recommended to perform a calibration once a year to assure the measuring
accuracy.
Required instruments:
DC Voltage Standard: YOKOGAWA Model 2552 or equivalent.
Decade Resistance Box: YOKOGAWA Model 2793-01 or equivalent.
11.5 Calibration
Calibration procedure:
1 Connect the calibration instrument to the input terminals of the recorder as shown in
figures 11.3, 4 , 5 or 6 and allow the recorder to warm up for at least 30 minutes.
Allow the instrument to warm up according to its specifications.
2 Check that the ambient temperature and humidity are within Normal Operating
Conditions (see chapter 10 ‘General Specifications’).
3 Apply an input corresponding to 0, 50 and 100 percentage of the entered setting range,
and calculate errors from the readings on the display.
4 If the error is at any point outside the accuracy limits (for accuracies, see chapter 10
‘General Specifications’), contact your nearest Sales & Service Office. Addresses may
be found on the back cover of this manual.
NOTE For a TC input, it is necessary to measure the temperature of the input terminals, and
add a voltage corresponding to the reference temperature.
DC Voltage Measurement
The figure blow shows the pen model, but connection should be done in the same way
for the dot model.
Power Supply terminal
(for others than /P1 model)
1
2
3
4
– +
L
N
Input terminals
(DC V & TC inputs)
Figure 11.3 DC Voltage Measurement
DC Voltage Standard
+
G
–
11 - 5
11. MAINTENANCE