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2 – General Information
20
the HP 6632A, 6633A, and 6634A Series dc power supplies (refer to appendix D in the the
Programming Guide). Dc source status registers allow remote monitoring of a wide variety of dc
source operating conditions.
Output Characteristic
The dc source’s output characteristic is shown in the following figure. The output of the dc
source may be adjusted to any value within the boundaries shown.
Output
Voltage
Output
Current
Imax
Vmax
ISET-ISET
VSET
CC operating line
CV operating line
0
1
2
+
-
-Imax
Figure 2-1. Dc Source Output Characteristic
The dc source can operate in either constant voltage (CV) or constant current (CC) over the rated
output voltage and current. Although the dc source can operate in either mode, it is designed as a
constant voltage source. This means that the unit turns on in constant voltage mode with the
output voltage rising to its Vset value. There is no command for constant current operation. The
only way to turn the unit on in constant current mode is by placing a short across the output and
then enabling or turning the output on.
Note that the dc source cannot be programmed to operate in a specific mode. After initial turn-
on, the operating mode of the unit will be determined by the voltage setting, the current setting,
and the load resistance. In figure 2-1, operating point 1 is defined by the load line traversing the
positive operating quadrant in the constant voltage region. Operating point 2 is defined by the
load line traversing the positive operating quadrant in the constant current region.
Figure 2-1 also shows a single range − two quadrant capability. This means that the dc source is
capable of sourcing as well as sinking current over the output voltage range from zero volts to the
rated maximum. The negative quadrant is identical to the positive quadrant. However, the
negative current cannot be set independently; it tracks the value programmed for the positive
current. Thus, if the positive current is set to 1 A, the negative current is also set to 1 A.
NOTE: If you attempt to operate the dc source beyond its output ratings, the output of
the unit will become unregulated. This is indicated by the UNR annunciator on
the front panel. The output may also become unregulated if the ac input voltage
drops below the minimum rating specified in Appendix A.
Appendix A documents the dc source’s specifications and supplemental characteristics.
- USER’S GUIDE 1
- Dynamic Measurement DC Source 1
- HP Model 66332A 1
- System DC Power Supply 1
- Warranty Information 2
- Safety Summary 3
- Declaration Page 5
- Acoustic Noise Information 6
- Printing History 6
- Table of Contents 7
- Quick Reference 9
- The Front Panel - At a Glance 10
- Front Panel Number Entry 11
- Front Panel Annunciators 12
- Immediate Action Keys 12
- 1 – Quick Reference 13
- The Rear Panel - At a Glance 15
- General Information 17
- Safety Considerations 18
- Options and Accessories 18
- Description 19
- Output Characteristic 20
- Installation 21
- Location 22
- Input Connections 23
- Output Connections 23
- Remote Sense Connections 24
- Sense Leads 25
- OVP Considerations 26
- Fast/Normal Operation 27
- INH/FLT Connections 27
- Digital I/O Connections 28
- Installation - 3 29
- Figure 3-4. FLT/INH Examples 29
- Controller Connections 30
- Turn-On Checkout 31
- Checkout Procedure 32
- Turn-On Checkout - 4 33
- In Case of Trouble 34
- Front panel Operation 35
- System Keys 37
- Function Keys 38
- Metering Keys 39
- Output Control Keys 40
- Entry Keys 41
- CURR:DET ACDC 44
- Specifications 49
- Supplemental Characteristics 50
- Specifications - A 51
- A - Specifications 52
- Verification and Calibration 53
- Current Sink Measurement 56
- Front Panel Calibration Menu 59
- Front Panel Calibration 60
- Calibration Error Messages 62
- Calibration Over the HP-IB 63
- Error Messages 65
- C - Error Messages 66
- Error Messages - C 67
- Line Voltage Conversion 69
- Install the Correct Line Fuse 70
- Close the Unit 70
- Index 73
- HP Sales and Support Office 74
- Manual Updates 75
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