Agilent Technologies n3306a User Manual download pdf (Page 33)

2 - General Information

20A Input (programmed via GPIB or front panel)

± 1V (2 V peak-peak) 1 kHz external programming signal

The external programming signal (+ 1 and - 1 volt) corresponds to + 6 and - 6 amps at the input (1 volt external

programming input = 1/10 full scale). Therefore, the input varies ± 6A at the 20A level.

Fault

The Fault signal becomes active if an overvoltage or reverse voltage occurs at the input, as described in the

Protection Features paragraphs.

Figure 2-9. External Programming Example

Port On/Off

Port is a general purpose output port that can be used to control an external device such as a relay for power

supply test purposes. The output is toggled on and off via the GPIB (PORT0 ON | OFF command). It cannot

be controlled from the front panel.

The Port output signal is a TTL compatible signal that becomes active (high level) when the PORT command is

programmed ON and becomes inactive (low level) when the PORT command is programmed OFF.

Input Measurements

Each module's input current, voltage, and power are continuously measured at the front panel.

With remote control in effect, a module may be instructed to measure its dc input voltage, current, or power by

sending the appropriate query command (e.g. MEAS:CURR). The results will be read back when the

electronic load is addressed to talk. Voltage and current measurements are performed with approximately 16-bit

resolution of full-scale ratings. Power is computed from this information. Voltage and current are measured

simultaneously, so that power data is correct.

All measurements are performed by digitizing the instantaneous input voltage or current for a defined number of

samples and sample interval, storing the results in a buffer, and then calculating the measured result. Many

parameters of the measurement are programmable. These include the number of samples, the time interval

between samples, and the method of triggering. Note that there is a tradeoff between these parameters and the

speed, accuracy, and stability of the measurement in the presence of noise. This is described in the

Programming Guide.

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Agilent Technologies n3306a User Manual Page 33