Local Operation
3-7
2. Press 1 , 2 , 0 then press ENTER
to change the value to “120.0”. Vac LIMIT(A) = 120.0
The setting of Vac LIMIT is not restricted by RANGE, but the Vac on
MAIN PAGE is restricted by RANGE. For example, in 150V RANGE,
although Vac LIMIT= 200V, the largest value of Vac setting is 150V.
3.5.3 Vdc LIMIT (+), Vdc LIMIT (-)
Vdc LIMIT (+) and Vdc LIMIT (-) limit the setting value of Vdc on MAIN PAGE. Users can set
both on SETUP functional list (see 3.5). The setting value of Vdc cannot be higher than Vdc
LIMIT (+) or lower than Vdc LIMIT (-). Vdc LIMIT (+) must be positive or zero, while Vdc
LIMIT (-) must be negative or zero. This command is about user-programmable protection,
not hardware protection.
The procedures of setting Vdc LMT (+)=200V, Vdc LMT (-)=-50V are described as below:
1. Move the cursor to the command line
of “Vdc LIMIT(+) = ”. Vdc LMT(+) = 424.2_ Vdc LMT(-) = 0.0
2. Press 2 , 0 , 0 then press ENTER
to change the value to “200.0”. Vdc LMT(+) = 200.0 Vdc LMT(-) = 0.0_
3. The cursor moves to the command line
of “Vdc LIMIT(-) = ” automatically. Vdc LMT(+) =200.0 Vdc LMT(-) = -50_
4. Press
/ - , 5 , 0 then press
ENTER to change the value to “-50.0”. Vdc LMT(+) = 200.0 Vdc LMT(-) = -50.0
1. The setting of Vdc LIMIT is not restricted by RANGE, but the Vdc on
MAIN PAGE is still restricted by RANGE. For example, in 150V
RANGE, although Vdc LIMIT = 250V the largest value of Vdc setting is
212.1V.
2. When the AC Source output contains Vdc, it's better to restrict the
value of Vdc. It may cause damage if output polarity is reversed,
especially if the load has polar.
3.5.4 I LIMIT, DELAY
Limitations of output RMS current and delay time are the parameters for triggering over
current protection. The user can set both on SETUP functional list (see 3.5). The
discussion of limitation in this command is about user-programmable protection, not hardware
protection.
The procedures of setting Current limit = 4A, Delay time = 1 sec., are described as below:
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