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Keithley 248 High Voltage Supply
The programmable Model 248 High Voltage Supply offers reversible
polarity, excellent
regulation, low output voltage ripple, and flexible operation. Two front
panel digital displays provide accurate readings of voltage and current output. A separate
display simplifies setting output values precisely. The Model 248s output can be set using the front panel controls, over the
standard IEEE-488
interface, or via a remote analog voltage.
VOLTAGE
RANGE: 0 TO ±5000V DC
| Output Voltage |
Max. Output Current |
Conditions |
| 0
to ± 5000 V DC |
5.000
mA DC |
NO
FILTER |
| 0
to ± 3000 V DC |
5.000
mA |
DC
FILTER 1 |
| 0
to ± 5000 V DC |
3.000
mA |
DC
FILTER 2 |
VOLTAGE
SET ACCURACY: ±(0.01%
of setting + 0.05% of range)
VOLTAGE
DISPLAY ACCURACY: Voltage
Set Accuracy ±1V, typical
<o:p> (±2V,
max.)
VOLTAGE
RESOLUTION: 1V
(set and display)
VOLTAGE
RESET ABILITY: 1V
VOLTAGE
LIMIT RANGE: 0
to 100% of full scale
VOLTAGE
REGULATION:
-
Line: 0.001%
for ±10% line voltage change
-
Load: 0.005%
for 100% load change, typical
OUTPUT
RIPPLE (10Hz100kHz):
| 0.002%
of full scale, Vrms, max. |
NO
FILTER |
| 1.0mV
rms @ 1kV |
FILTER
1 or FILTER 2 |
| 2.0mV
rms @ 3kV |
FILTER
1 or FILTER 2 |
| 3.0mV
rms @ 5kV |
FILTER 2 |
| Current Voltage |
Current Limit & Trip Range |
Filter |
| 0
V to 1.5 kV |
0.4 mA to 5.25 mA |
NO FILTER or FILTER 1 |
| 0.4
mA to 3.25 mA |
FILTER
2 |
| 1.5
kV to 5.0 kV |
0.5 mA to 5.25 mA |
NO FILTER or FILTER 1 |
| 0.5
mA to 3.25 mA |
FILTER 2 |
CURRENT
LIMIT ACCURACY: 0.01%
+ 2.5µA
CURRENT
RESOLUTION: 1µA
CURRENT
DISPLAY ACCURACY: Current
Set Accuracy ±1µA, typ.
(±2µA, max.)
STABILITY: ±0.02%
per hour typical for ambient temperature within 2°C
TEMPERATURE
DRIFT: 50ppm/°C,
0° to 50°C, typical
PROTECTION: Arc and
short circuit protected; programmable
voltage
and current limits and current trip
SETTLING TIME:
-
From
0 to Programmed Voltage: To
within 99.9% of final
value
within 3s
-
Discharge
Time from Programmed Voltage to Within 50V
of
Zero: Within
6s for no load (faster with load, slower with
filters on)
MONITOR
OUTPUTS:
-
Output
Scale: 0
to +10V for 0 to full range output regardless
of polarity
-
Current
Rating: 10mA maximum
-
Output
Impedance: <1W
-
Accuracy: ±0.2% of
full scale
-
Update
Rate: 8Hz
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