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Zero Carryover
Figure 1. A3S1 service switch.

Calibration Procedure For Power Meter, Model 438A And 438Aopt002 Page Navigation
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TB 9-6625-2278-24
(6) Press TI keys as listed in (a) through (c) below. TI display will indicate within
the limits specified in table 3; if not, perform b below.
(a) MNL RANGE.
(b) 2.
(c) ENTER.
(7) Repeat technique of (6) above for remaining MNL RANGE settings listed in
table 3.
(8) Press TI LINE and range calibrator LINE switches to OFF position.
(9) Move cable connection from channel A power sensor input to channel B power
sensor input.
NOTE
For (10) below, press SENSOR B key when repeating (3)(c)
above.
Table 3. Power Meter Zero Carryover
MNL RANGE
Test instrument display indications
key settings
Min
Max
W
W
2
-0.1
+0.1
3
-0.001 mW
+0.001 mW
4
-0.01  mW
+0.01  mW
5
-0.1
mW
+0.1
mW
(10) Repeat (3) through (7) above for channel B sensor input.
NOTE
Perform (11) through (15) below only if TI has option 002.
(11) Repeat (8) above.
(12) Move channel B power sensor connection (front panel) to channel A power
sensor input (rear panel).
(13) Repeat (3) through (8) above.
(14) Move cable connection from channel A power sensor input (rear panel) to
channel B power sensor input (rear panel).
NOTE
For (15) below, press SENSOR B key when repeating (3)(c)
above.
(15) Repeat (3) through (7) above for channel B sensor input.
b. Adjustments
(1) Press TI and range calibrator LINE switches to OFF position.
(2) Disconnect TI from range calibrator.
(3) Remove TI top cover.
5


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