Tektronix DCM300, Technical Reference

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DTM900 and DTM920 Adjustment Procedures
Handheld and Benchtop Instruments Basic Service
13
DTM900 Adjustment Procedure
This section describes how to adjust the DTM900 thermometer. To properly
adjust the thermometer, perform the following steps in sequential order.
1. Open the thermometer as described in the previous section.
2. Turn on the thermometer and allow it to warm up for at least 30 minutes.
3. Connect the thermocouple simulator to the probe connector.
4. Set the simulator probe type to K.
5. For each row in Table 7, set the thermometer and simulator as shown; then
adjust the specified test point until the displayed temperature is within the
proper limits. Figure 2 shows the location of the adjustment points.
Table 7: DTM900 Adjustment Procedures
Thermometer Setting Simulator Setting
C/F Resolution Temperature Test Point Temperature Limits
C 0.1
_
0
_
C VR1 –00.1
_
and 00.1
_
F 1
_
1000
_
C VR3 1831
_
and 1833
_
C 1
_
1000
_
C VR5 999
_
and 1001
_
C 0.1
_
190
_
C VR2 189.9
_
and 190.1
_
F 0.1
_
0
_
C VR4 31.9
_
and 32.1
_
C 1
_
1000
_
C VR3 999
_
and 1001
_