Instructions

4
Constant Resistance Mode (CR)
Resistance Range:
50 Ω to 10 kΩ (1 Ω resolution).
Setting Accuracy:
±0·5% ± 2 digits ± 30 mA (V > 25 Volts).
Regulation:
< 2% for 90% load power change (V > 25 Volts).
Temperature Coefficient:
< (±0·04% ± 5 mA) per ºC.
(1)
Slew Rate Range:
1 Ω per ms to 100 Ω per µs.
(2)
Minimum transition time:
150 µs.
Constant Conductance Mode (CG)
Conductance Range:
0·001 to 1 A/V (1 mA/V resolution)
Setting Accuracy:
± 0·5% ± 2 digits ± 30 mA (V > 25 Volts).
Regulation:
< 2% for 90% load power change (V > 25 Volts).
Temperature Coefficient:
< (±0·04% ± 5 mA) per ºC.
(1)
Slew Rate Range:
0·1 A/V per s to 10 A/V per ms.
(2)
Minimum transition time:
150 µs.
TRANSIENT CONTROL
Transient Generator
Pulse Repetition Rate:
Adjustable from 0·01Hz (100 seconds) to 10kHz.
Pulse Duty Cycle:
1% to 99% (percentage of period at Level A).
Setting Accuracy:
±1 %
Slew Rate Control
The slew rate control applies to all changes of level whether caused by manual selection, remote
control or the transient generator.
The level change is a linear slew between the two level settings. The range available in each
mode is shown above.
Setting Accuracy:
± 10% (on linear part of slope, excluding high frequency aberrations).
Variation in Level Settings:
± 5 digits of specified setting resolution for present mode and range.
Oscillator Sync Output
Connection: Terminal block on rear panel. Lo terminal output grounded to chassis
internally. TTL/CMOS (5V) output. High during Level B phase of
internal transient generator.
Isolation:
CATII (300V) to load negative.
DROPOUT VOLTAGE
The load will cease to conduct if the applied voltage falls below the Dropout Voltage setting;
active in all modes. The Dropout Voltage setting is also the threshold for the Slow Start facility
and acts as an offset voltage in Constant Resistance mode.
Setting Accuracy:
± 2% ± 200mV.
Slow Start
If Slow Start is enabled, the load will not conduct any current until the source voltage reaches the
Dropout Voltage setting; it will then ramp the controlled variable up (in CC, CP and CG modes) or
down(in CR mode) to the Level setting at a rate determined by the Slew Rate setting.