14
I=U/R (see Fig.2-3). Press
key in basic mode to enter into mode selection and parameter setting
menu. Choose CR mode with
and
keys. Input the resistance value via the Entry keys or
the knob with
and
keys. Use
key for confirmation. The CR mode and parameters
can also be set via remote command (MODE CRL, MODE CRM, MODE CRH, RESistance <NRf+>).
Fig.2-3 CR Mode
2.3.3.1
Setting Ranges
The setting ranges for different models of load are listed as follows:
Model 3720A
3721A
3722A
3723A
3724A
Mode
CRL 0.02~2
Ω
0.02~2
Ω
0.0666~6.66
Ω
0.0666~6.66
Ω
0.125~12.5
Ω
CRM 2~200
Ω
2~200
Ω
6.66~666
Ω
6.66~666
Ω
12.5~1250
Ω
CRH 20~200
Ω
20~200
Ω
66.6~6660
Ω
66.6~6660
Ω
125~12500
Ω
If the range is changed in CR mode while the load’s input stays in ON status, the load will be
turned off for around 5ms automatically. For example: when the load is switched from CRL to CRH,
the input will be turned off around 5ms. Besides, it is noted that the resistance set level may change
with the resistance range to fit the new range. Take 3721A for example, the present setting is CRM
10.000
Ω
, when the load is switched from CRM to CRL, the resistance set level will change to the
maximum level 2.0000
Ω
for CRL.
2.3.3.2 Immediate Resistance Level
The immediate resistance level refers to the resistance set value in CR mode, which can be set via
mode selection and parameter setting menu, or via remote command (RESistance <NRf+>). The
immediate resistance level can also be modified directly with left/right keys (
) and the knob
in CR mode.
2.3.3.3
Triggered Resistance Level
The triggered resistance level refers to the preset resistance value, which can become immediate
resistance level automatically when a trigger is received. If the CR mode and the input are enabled, the
input will be updated immediately when a trigger occurs. If the CR mode is not active, this resistance
