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8
– LOW CURRENT DECK
8-4
Version 1.23
MODEL 5000 SERIES MANUAL
Externally programmed R
GK
(gate-cathode) and R
GS
(series gate) loads are attached
to the Low Current Deck panel jacks to keep them in close proximity of the device
under test. For tests such as I
CBO
that require the base (gate) lead to be open, the
disconnect relay is located in the Low Current Deck to reduce the effects of lead wire.
8.3.2 Testing
Either the start button on the 5000 Series Tester front panel or the start button on the
Low Current Deck panel may be used to start the test for manual operation. The
interlock on the Low Current Deck must be jumpered for the Low Current Deck start
button to operate. The “Remote Deck” switch must be on.
Note: The 5000 Series Tester will function properly without the Low Current Deck
attached or the “Remote Deck” switch on, but any test with limits programmed below
100
ηA require the Low Current Deck. If such testing is initiated without the Low
Current Deck attached and “Remote Deck” switch on, the test sequence will be
interrupted and “LO-DECK ERROR” will be displayed. Press the “Enter” key to
continue. The Low Curr
ent Deck must be attached and/or the “Remote Deck” switch
must be on or the test step must be edited to increase the entries to at least 100
ηA.
Operation with the handler is the same as with the 5000 Series Tester. Make
connection as described in Section
2.2 of this manual. Set the “Remote/Local” switch
to “Remote” for the handler to initiate the start test.
8.3.3 Calibration
Calibration of the Low Current Deck is accomplished by nulling the offset of two
amplifiers within the Low Current Deck. To calibrate:
Remove the top cover to access the G-K Board (the front board).
With the Low Current Deck properly attached to the 5000 Series Tester, turn
on the power switch. From the PCW “Runtime” - “Self-Test” – “Calibrate”
menu, select “Calibrate LCD”.
Use a DVM and attach the return lead to TP-1 (junction of CR1, CR2).
Adjust R6 to obtain 0.0mV ±0.2mV at TP-2 (U3-6).
Adjust R2 to obtain 0.0mV ±0.2mV at TP-3 (U1-6).
Exit “Calibrate LCD”
Replace cover.
Note:
Adjustment will usually not be necessary unless op-amp U1 or U3 is replaced.
8.4 Self-Test
8.4.1 Self-Test after unpacking
Unpack the 5000 Series Tester first as described in Section 2 and then run the
Mainframe Self-Test with the Mainframe Self-Test fixture installed. Install the Low
Current Deck and then run the Low Current Deck Self-Test with the Low Current
Deck Self-Test fixture installed.
R
GK
loads must be attached externally to the Low
Current Deck R
GK
jacks. No internal R
GK
loads are
provided.
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