4.1 Measuring with Constant Voltage or Current (ALC)
4-4 ZM2376
When the ALC function (CV or CC) is enabled, ZM2376 repeats the measurement while adjusting
the measurement signal level until the following values are obtained.
CV: Voltage monitored value is the set value ± 1% of set value.
CC: Current monitored value is the set value ± (1% of set value + 0.02% of max. drive / detection
current in measurement range)
Accordingly, the measurement will take time.
When the measurement range is automatic selection, first the measurement range is selected and
determined. Then, the measurement signal level is changed in a range of 10mVrms to 5Vrms to
adjust to the specified voltage or current. It cannot be adjusted to a value that exceeds the maximum
current or voltage which can be detected with the measurement range.
There are the following other restrictions.
Due to the characteristic variations of ZM2376, the voltage or current may not be adjusted to
settable maximum voltage or maximum current.
The upper limit of the adjustable range of the measurement signal level is restricted to 1.2V in
the following conditions.
Rd: Minimum output impedance
Rd = 25Ω-100 CV is enabled, and the signal level ≤ 1.05Vrms
Rd = 6Ω-100-f1k CV is enabled, and the signal level ≤ 1.05Vrms
CC is enabled, and the current setting ≥ 40mArms
When the DC bias output is on, the DC bias voltage takes precedence, and the adjustable range
of the measurement signal level is restricted as follows.
Measurement signal level < 5 - (DC bias voltage setting value [V]) × 0.7071 [Vrms]
When the auto DC balance function is enabled, use the following value instead of the DC bias
setting value.
DC bias voltage setting value[V] + 0.25[V] (up to 5[V])
With a DC bias currency (leak current), the adjustable range decreases.
When the voltage-current characteristic of DUT is extremely nonlinear or the value changes in
short term, the specified voltage or current cannot be obtained, and an error occurs
(measurement value ALC Err) even though the measurement signal level is adjusted
repeatedly.
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