3-50
BOP HIPWR 091719
3.4.4.2
VARIABLE GAIN USING EXTERNAL REFERENCE LEVEL
The BOP can function as a variable gain power amplifier for both voltage and current modes,
similar to the fixed (inherent or nominal) gain amplifier as described in PAR. 3.4.4.1. The user
can determine a new (lower) full scale output value for the ±10V reference level (applied at pin
11, referenced to pin 10, of the Analog I/O port) by configuring the Reference input as follows:
1. From the power-up screen press
$
and highlight Reference Input. Press
!
, highlight
ExtlRefLevel and press
$
. Then press
%
to apply the changes (without saving for power-
up) and exit.
2. To return to digital or local control, from the power-up screen, press
$
, then highlight Ref-
erence Input and press
!
. Highlight Internal and press
$
to save. Then press
%
to
apply the changes (without saving for power-up) and exit.
NOTE: Each time the Reference Input setting is changed, the unit generates an internal *RST
reset command (see PAR. A.11) which requires the BOP output and/or protection limits
to be reprogrammed.
The adjustment range of the gain is between zero and 100% of the nominal gain, but 10% is
recommended as the minimum value.
For an external reference of ±10V, the nominal voltage gain (G
NOM-V
) of a BOP 36-28MG is
36/10 = 3.6. If the new full scale voltage for 10V is set to 29V, the voltage gain is changed from
3.6 to 29/10 = 2.9. The gain can be changed from the front panel, but the output is controlled by
the external reference signal and can not be changed from the front panel.
New Gain = New Full scale set at front panel / External reference that produces Full scale out-
put. This means that the External reference voltage, from +10V to –10V, can control the full
scale output voltage from +29V to –29V. The gain range is between zero and the nominal gain
of each model.
Once the feature is configured, the new full scale value is entered by changing the active setting
value of the main channel. This determines the full scale output to be produced by a 10V exter-
nal reference.
The gain in voltage mode is G
V
= | V
SET
|/10 where | V
SET
| is the absolute value of desired full
scale voltage (in Volts) entered at the front panel.
The gain in current mode is G
A
= | I
SET
|/10 where | I
SET
| is the absolute value of desired full
scale current (in Amperes) entered at the front panel.
NOTE: If the system limits have been modified (PAR. 3.3.4), the output of the power supply will
never exceed the modified system limits.
3.4.5
EXTERNAL PROTECTION LIMITS
When Protect Limit on the Reference Menu is set to External, the protect limits are determined
by four analog signals referenced to Ground (pin 12) which are applied to the Analog I/O Port
(see Table 2-10).
To be functional this feature must first be configured either from the front panel, or by sending
either CURR:MODE:PROT EXT (see PAR. B.39) or VOLT:MODE:PROT EXT (see PAR. B.115).
From the front panel power-up screen press
$
, and highlight Protect Limit. Press
!
to mod-
ify, then highlight External and press
$
to save. Then press
%
to apply the changes (without
saving for power-up) and exit.
Summary of Contents for BOP-ME 1KW
Page 2: ......
Page 20: ...xii BOP 1K 091719 FIGURE 1 1 HIGH POWER BOP SERIES POWER SUPPLY...
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Page 64: ...2 22 BOP HIPWR 091719 FIGURE 2 11 PARALLEL CONFIGURATION LOCAL SENSING TYPICAL...
Page 65: ...BOP HIPWR 091719 2 23 FIGURE 2 12 PARALLEL CONFIGURATION REMOTE SENSING TYPICAL...
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Page 161: ...BOP HIPWR 091719 3 85 FIGURE 3 29 STATUS REPORTING STRUCTURE...
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