KEPCO ATE 100-10DMG, Operator'S Manual

Page: 21 / 98

ATE-DMG OPER 020613
1-5
1.6 FEATURES
1.6.1 OVERVOLTAGE/OVERCURRENT PROTECTION
Overvoltages and Overcurrent protection values can be individually programmed via the front
panel keypad or remotely via the IEEE 488.2 (GPIB) using SCPI commands (refer to PARs.
3.4.9 and 3.7). When overvoltage or overcurrent is detected, the power supply is programmed
to 0 volts with a small current and the power supply responds as if an *RST command was
received over the GPIB bus. See Table 1-4 for maximum programmable settings.
1.6.1.1 PROGRAMMABLE OVERVOLTAGE/OVERCURRENT DELAY
Changing the output settings may cause large output transients (common with reactive loads)
that can trip the overvoltage/overcurrent protection. The ATE-DMG can be programmed to delay
sensing of overvoltage/overcurrent protection when output settings are changed to avoid inad-
vertent tripping. After the delay, the programmed overcurrent/overvoltage setting is effective.
Protection can be delayed up to approximately 8 seconds after the output settings are changed.
Refer to PAR. 3.4.10.
TABLE 1-5. ATE STATIC SPECIFICATIONS
INFLUENCE QUANTITY
OUTPUT EFFECTS VOLTAGE MODE OUTPUT EFFECTS CURRENT MODE OFFSETS
(4)
TYPICAL MAXIMUM TYPICAL MAXIMUM
∆
E
IO
∆
I
IO
SOURCE VOLTAGE (min. - max.)
<0.0005% E
O
max. <0.001% E
O
max. <0.002% I
O
max. <0.005% I
O
max.
<1
µ
V <1nV
LOAD (no load - full load):
<0.001% E
O
max. <0.002% E
O
max.
<0.5 mA
(1)
<1 mA
(1)
– –
TIME (8 hour drift)
<0.005% E
O
max. <0.01% E
O
max. <0.01% I
O
max. <0.02% I
O
max.
<20
µ
V <1nV
Temperature per °C
<0.005% E
O
max. <0.01% E
O
max. <0.01% I
O
max. <0.02% I
O
max.
<20
µ
V <2nV
Ripple and noise
(2)(5)
(Slow mode)
rms: <0.1mV <0.3mV
<0.01% I
O
max. <0.03% I
O
max.
– –
p-p:
(3)
<1mV <3mV
<0.1% I
O
max. <0.3% I
O
max.
– –
Ripple and noise
(2)(5)
(Fast mode)
rms: <1mV
<3mV
(4)
<0.01% I
O
max. <0.03% I
O
max.
– –
p-p:
(3)
<10mV
<30mV
(4) <0.1% I
O
max. <0.3% I
O
max.
– –
(1) For I
O
>50A, load effect = 2mA typ., 5mA max in slow mode. The output capacitor adds 0 - 6 mA to current mode load effect.
(2) One terminal grounded so that common mode current does not flow through load or current sense resistor.
(3) Bandwidth: 20Hz - 10 MHz.
(4) Preamplifier offsets are given for the calculation of the output effects of preamplifiers (A, B) if either of these amplifiers is used for operational
programming. In this case, the value of the external feedback and input resistors, the amplifier offsets and the reference voltage variations are
combined in the “Error Equation,” which represents the “worst case” output effects for the application at hand:
where:
∆
E
O(preamp)
= Total Preamp Output Voltage change
∆
E
ref
= Change in the Voltage Reference
∆
E
iO
= Change in Offset Voltage
∆
I
iO
= Change in Offset Current
R
f
= External Feedback Resistor
R
i
= External Input Resistor
NOTE 1: Variations in the value of the feedback and input resistors are considered secondary effects in the error equation.
NOTE 2: In the voltage mode of operation, the calculated preamp output effect
∆
E
O(preamp)
, must be multiplied by the (fixed) gain of the ATE
voltage channel to find out the total effect on the output voltage of the ATE power supply. The (fixed) gain of the ATE voltage channel is given by
GAIN = E
O max
/10, where E
O max
is the maximum rated output voltage of each ATE model. In the current mode of operation, the effect of the
preamplifier offsets on the total output current may be expressed as a percentage of I
O max.
by the equation:
(5) For high voltage ATE 325-0.8M the maximum output ripple and noise is 10mV rms and 50 mV p-p.
∆
E
O preamp
( )
∆
E
ref
R
f
R
i
⁄ ( ) ∆
E
iO
1 R
f
R
i
⁄
+
( ) ∆
EI
iO
R
f
+ + =
∆
I
O
%
( )
∆
E
O preamp
( )
1 Volt
------------------------------- 100%
×
=