B&K Precision 866C Manual de usuario Pagina 41
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front panel using the I-set, V-set, P-set, or R-set keys.
To set these protection values, use the following keystrokes:
Keys Display
Shift + Menu :CONFIG
▽ :SYSTEM SET
Enter Select between:
:MAX CURRENT SET
:MAX POWER SET
:MAX VOLTAGE SET
using the △ and ▽ arrow keys, then press Enter. Enter the desired value,
then press Enter to accept it.
Esc Esc Exit from the menu.
Example: Suppose you are measuring current vs. voltage characteristics of a 1 watt resistor. You
could set the maximum allowed power to 1.1 watts to test the resistor's rating, yet not go over the
maximum rating by more than 10% to ensure you don't destroy the resistor. If you tried to use the P-
set key to set the power to more than 1.1 W, the instrument will limit the set value to 1.1 W.
Over Voltage protection
If input voltage exceeds the voltage limit set by the user, the DC load will turn the input OFF and the
buzzer will sound. The display will show OVER VOLTAGE. The maximum voltage limit value is equal to
the maximum rated voltage for each model. For the over voltage protection state to be activated, the voltage
level presented to the load terminal must exceed the limit set value by approximately 5%.
Over Current protection
When operating in CR, CC or CW mode, the load current will be limited by a current limit value set
by the user. The maximum current limit value is equal to the maximum rated current for each model.
Once the maximum current limit is reached, the DC Load will enter the over current protection state
and the current will be limited to the set value. (The input will not turn off). If the DC load previously
operated CR or CW mode, the DC load will automatically revert to CC mode and the VFD display
will indicate CC. When the DC load operates in a combined CV / transition mode or CV / List mode,
the buzzer will sound if the input current exceeds the current limit and the display will show a
flashing current value.
Over Power protection
If the input power exceeds the power limit in the normal operation mode, the DC load will enter the over power
protection state. The display will show CW.
If the input power exceeds the limit when in transition mode or list mode, the buzzer will sound and the
display will flash the current value and voltage value.
Reverse voltage protection
This feature protects the load module in case the DC input terminals are connected to a power source with
8500 DC Load Series Version: November 4, 2008 Page 41 of 76
- USER MANUAL 1
- 8522, 8524 & 8526 1
- Safety Symbols 2
- Table of Contents 3
- Notation 5
- Quick reference 6
- Typical tasks 7
- Front panel 7
- Standard display 9
- Front panel keys 9
- Rear panel 10
- Display annunciators 11
- Specifications 15
- Environmental Conditions 16
- Low Voltage Characteristics 18
- Slew rate 19
- 0.5A / S 20
- Glossary 21
- Models: 8500& 8502 23
- Models 8520, 8522 24
- Models 8524 & 8526 25
- Bench operation 26
- First turn-on checkout 27
- Operational introduction 28
- Power-on state 29
- Constant current mode 29
- Constant voltage mode 30
- Constant power mode 30
- Constant resistance mode 31
- Timed operation 31
- Changing display resolution 32
- Battery test 32
- 2.0ms 3.0ms 33
- Pulse transient operation 34
- Toggled Transient Operation 35
- 10 2 3 4 5 36
- List count=1 List count=2 36
- List sequence 36
- Test files 37
- Triggering 39
- Voltage threshold operation 40
- Passwords 40
- Protection features 40
- Over Voltage protection 41
- Over Current protection 41
- Over Power protection 41
- Reverse voltage protection 41
- Remote sensing 42
- Saving and Recalling settings 43
- PC Load 44
- IT-E131 communication 44
- COMPUTER 44
- INSTRUMENT 44
- RS-232 settings 45
- Status packets 46
- Example program 46
- Chapter organization 48
- Summary of commands 49
- Notation for tables 51
- 0x2A Set CC mode current 55
- 0x2B Read CC mode current 55
- 0x2C Set CV mode voltage 55
- 0x2D Read CV mode voltage 55
- 0x2E Set CW mode power 56
- 0x2F Read CW mode power 56
- 0x30 Set CR mode resistance 56
- 0x4C Save the list file 63
- 0x4D Recall the list file 63
- 12-24 Reserved 70
- In case of trouble 72
- Alphabetical Index 75
- Printed in China 76
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