Range switching – HP 6627A User Manual
Page 70
Remote Operation
70
Table 5-4. Programmable Output Ranges for the HP 662lA-6624A and 6627A Supplies
Model
Output
Channel
Operating
Range *
Output Voltage
(Avg.
Resolution)
Output
Current-(Avg.
Resolution) **
Overvoltage
Range(Avg.
Resolution
6621A
1 & 2
Low
0 to 7.07 V
0.13 to 10.30 A
0 to 23 V
(80 W Low V)
High
0 to 20.2 V
0.13 to 4.12 A
(0.10 V)
(0.006 V)
(0.050 A)
6622A
1 & 2
Low
0 to 20.2 V
0.07 to 4.12 A
0 to 55 V
(80 W High V)
High
0 to 50.5 V
0.07 to 2.06 A
(0.25 V)
(0.015 V)
(0.020 A)
6623A
1
Low
0 to 7.07 V
0.08 to 5.15 A
0 to 23 V
(40 W Low V)
High
0 to 20.2 V
0.08 to 2.06 A
(0.10 V)
(0.006 V)
(0.025 A)
2
Low
0 to 7.07 V
0.13 to 10.30
0 to 23 V
(80 W Low V)
High
0 to 20.2 V
0.13 to 4.12 A
(0.10 V)
(0.006 V)
(0.050 A)
3
Low
0 to 20.2 V
0.05 to 2.06 A
0 to 55 V
(40 W High V)
High
0 to 50.5 V
0.05 to 0.824 A
(0.25 V)
(0.015 V)
(0.010 A)
6624A
1 & 2
Low
0 to 7.07 V
0.08 to 5.15 A
0 to 23 V
(40 W Low V)
High
0 to 20.2 V
0.08 to 2.06 A
(0.10 V)
(0.006 V)
(0.025 A)
3 & 4
Low
0 to 20.2 V
0.05 to 2.06 A
0 to 55 V
(40 W High V)
High
0 to 50.5 V
0.05 to 0.824 A
(0.25 V)
(0.015 V)
(0.010 A)
6627A
1-4
Low
0 to 20.2 V
0.05 to 2.06 A
0 to 55 V
(40 W High V)
High
0 to 50.5 V
0.05 to 0.824 A
(0.25 V)
(0.015 V)
(0.010 A)
*The maximum programmable voltage values for each range are 1% higher than the rated voltage and the maximum
programmable current values for each range are 3% higher than the rated current.
**Each output channel "wakes up" with current programmed to a small positive value. This permits the output channel's
output voltage to be programmed up without specifically programming the current. An output channel, in fact, cannot be
programmed to zero amps. If the output channel receives a command to go to zero amps, or any positive current below the
minimum programmable current, it will set itself to the minimum. Note that you can use the DCPON command to cause
the ouput channels to wake up with the current programmed to a small negative value. This prevents currrent overshoots
at turn on if the unit is operating in constant current mode.
Range Switching
Each output operates in the boundaries of either the low range or the high range as specified in Table 5-4. Refer to page
43 for a detailed description of the dual range operation. The range is selected based on the programmed parameters. If
the last parameter (voltage or current) programmed is outside of the existing range, the supply will automatically switch
ranges. A sequence of examples are given on the next page to illustrate this operation. Output 1, used in the examples, is a
40 W Low V output.
Example 1: VSET 1,5; ISET 1,2
This example programs output 1 to 5 V and 2 A. These values are in the quadrant of the characteristic curve which has
voltage and current boundaries common to both high and low operating ranges.