Keithley 2700, User Manual, Page: 49 / 500

1-32 Getting Started Model 2700 Multimeter/Switch System User’s Manual
Exercise 2 — Closing and opening channels (system channel operation)
The exercise in Table 1-7 demonstrates a sequence to close and open channels of a
Mode 7700 installed in slot 1 of the mainframe.
Simple scanning
NOTE
See Section 7 for details on scanning.
With at least one multiplexer switching module (i.e., Model 7700) installed in the
mainframe, the instrument can scan channels that are valid for the selected function.
For front panel operation, Figure 1-7 shows the three basic steps to configure and run a
simple scan. The differences between the STEP function and the SCAN function involve
the reading count and the timer.
Reading count (RDG CT) — For both STEP and SCAN, the reading count specifies the
number of readings to store in the buffer. For STEP, the reading count determines the
number of channels to scan.
Table 1-7
Exercise 2 — Close and open channels (system channel operation)
Front panel operation Command sequence
1 Open all channels*:
Press OPEN > display OPEN:ALL > Press OPEN. ROUT:OPEN ALL
2 Select
Ω
2 function:
Press
Ω
2. FUNC 'RES'
3 Close system channel 101:
Press the key. Channel 1 connects to DMM Input (see Figure 1-4 ). ROUT:CLOS (@101)
4 Close system channel 102:
Press the key. Channel 2 connects to DMM Input. ROUT:CLOS (@102)
5 Close system channel 106:
Press CLOSE > select CLOSE:SINGLE > key in channel 106 > press
ENTER. Channel 6 connects to DMM Input. ROUT:CLOS (@106)
6 Select
Ω
4 function:
Press
Ω
4. 4W annunciator turns on, and channels 6 and 16 connects to
DMM Input and Sense (see Figure 1-5 ).
FUNC 'FRES'
7 Open all channels*:
Press OPEN > display OPEN:ALL > Press OPEN ROUT:OPEN ALL
*It is a good, safe practice to start and end a switching sequence by opening all channels.