15
:CARD
Model 2750 commands only
If no card is in slot <NRf>, then all of these commands will generate a -241 “hardware missing”
error.
If the card does not
support the feature or channels being queried, then 0 will be returned.
Unlike the Model 2700/2702, the Model 2750 SYST:CARD queries have the slot passed as a <NRf> following the query
(rather than incorporated into the command name). For compatibility with existing Model 2700/2702 software, the
Model 2750 also accepts SYST:CARD1 or SYST:CARD2 (not recommended for queries when developing new software).
Example: To query the maximum voltage allowed on the card in slot 3, send:
:SYST:CARD:VMAX? 3
Measurement considerations
Termination of unused connectors
To minimize noise within the system, terminate unused channels with 50
Ω
loads. If 50
Ω
loads are not available, terminating
unused connectors with a cable may also reduce noise within the system.
Power handling
The graph in
Figure 7
shows the maximum amount of power per channel that can be routed using the Model 7711 or
Model 7712 while maintaining proper digital multimeter accuracy. Power levels of up to 10 watts at frequencies > 200MHz
can be used, but this may cause measurement errors. For example, routing 10 watts of power at 1GHz may cause the
Model 2700/2702 to have an additional 6
µ
V offset uncertainty when measuring DC voltages. For the Model 2750, the
precision low level circuitry may cause uncertainty of 30
µ
V. Moving the Model 7711/7712 to a higher number slot will reduce
this uncertainty.
Figure 7
Carry power (per channel) vs. frequency
0
2
4
6
8
10
12
10
100
1000
MHz
P
o
wer (w
atts)
3500
Additional DMM Uncertainty
200MHz
500MHz
Содержание 7711
Страница 1: ...Model 7711 7712 User s Guide PA 818 Rev B 8 03 A G R E A T E R M E A S U R E O F C O N F I D E N C E...
Страница 30: ...26 Figure 12 Model 7711 component layout...
Страница 31: ...27 Figure 13 Model 7712 component layout...
Страница 37: ......
