Fluke 5500A, Service Manual, Page: 60 / 296

5500A
Service Manual
3-6
3-8. Thermocouple Measuring
This procedure calibrates the temperature measuring capability of the 5500A by
externally measuring a known temperature. The connections are shown in Figure 3-1.
POWER
I
O
0 •
1 2 3
4 5 6
7 8 9
ENTER
M
k
m V Hz
FIELD
EDIT
/ +
F
OPR EARTH SCOPE BOOST MENU
PREV
SHIFT
RESET
CE
SETUP
REF
NEW
TC
MEAS
¡F
µ
n
p
W
dBm sec
¡C A
MULT
x
DIV
÷
OUT
TRIG
5500A CALIBRATOR
20V PK
MAX
HI
LO
TC
TRIG
OUT
1000V
RMS
MAX
20V
RMS
MAX
1V PK
MAX
20V PK
MAX
NORMAL AUX SCOPE
V, ,
RTD
A, -SENSE,
AUX V
200V PK
MAX STBY
5500 A
Dewar Flask
and Cap
Mineral Oil
Lag Bath
J type
Thermocouple
Mercury
Thermometer
om008f.eps
Figure 3-1. Connections for Calibrating TC Measure
1. Apply a copper short to the TC terminals. Allow the temperature of the short to
stabilize for 3 minutes.
2. Perform the "zero" calibration as indicated on the 5500A front panel.
3. Remove the copper short as instructed on the 5500A front panel.
4. Perform the "gain" CAL as follows: Plug a J thermocouple into the TC terminals as
Figure 3-1 shows. Allow the temperature to stabilize for 3 minutes. Measure a lag
bath that is within
±
2
°
C of ambient temperature. Compare this reading with a
precision temperature standard and enter the reading into the 5500A when prompted
to do so.