Brand: HP
Category: Power Supply
Document Type: Manual
Language: EN
Manual for 654xA,655xA,657xA
Uploaded: Nov. 21, 2025, 6:34 p.m.
Manual Publish Date: 1993-01-01
Warranty Information
Warranted against defects in material and workmanship for three years from date of delivery.
Enabling/Disabling Output: Press the "Output On/Off" key to toggle the power supply's output state. In the disabled state, the output is set to very low voltage and current settings.
Setting Voltage and Current: Use the "Voltage" and "Current" keys to display the respective settings, then use the ENTRY keys (0-9) to input the desired value. Alternatively, rotate the corresponding rotary controls. Values are rounded to the nearest multiple of the output resolution.
Monitoring Output: The LCD display shows the present output voltage and current. Annunciators indicate the operating mode (CV, CC, Unr) and protection status (OCP, Prot).
Setting Protection: Use the "OV" key to display and set the overvoltage protection level. Use the "OCP" key to enable or disable overcurrent protection.
Saving/Recalling States: Store up to 5 operating configurations (voltage, current, OVP settings, OCP/Output state) in nonvolatile memory using the "Save" key followed by a location number (0-4) and Enter. Recall stored states using the "Recall" key.
Setting Voltage and Current: Use the "Voltage" and "Current" keys to display the respective settings, then use the ENTRY keys (0-9) to input the desired value. Alternatively, rotate the corresponding rotary controls. Values are rounded to the nearest multiple of the output resolution.
Monitoring Output: The LCD display shows the present output voltage and current. Annunciators indicate the operating mode (CV, CC, Unr) and protection status (OCP, Prot).
Setting Protection: Use the "OV" key to display and set the overvoltage protection level. Use the "OCP" key to enable or disable overcurrent protection.
Saving/Recalling States: Store up to 5 operating configurations (voltage, current, OVP settings, OCP/Output state) in nonvolatile memory using the "Save" key followed by a location number (0-4) and Enter. Recall stored states using the "Recall" key.
Troubleshooting and error codes
| Control or Indicator | Function or Indication | |
|---|---|---|
| Protect | Protect | When the Prot annunciator comes on, press Protect to see which protection circuit caused the power supply to shut down. Response can be OC (overcurrent), UT (overtemperature), or OV (overvoltage). If no protection circuit has tripped, the display will show dashes (---). |
| Prot Clear | Prot Clear | Press this key to reset the protection circuit. If the condition that caused the circuit to trip has been removed, the Prot annunciator will go off. |
| OCP | OCP | Press to enable or disable the power supply OCP trip circuit. This key toggles between the two states. |
| OV | OV | Press to display the OV trip voltage setting. After pressing OV, you may use the ENTRY keys to change the value. |
| Unr Annunciator | Unr Annunciator | Indicates the power supply output is unregulated (output is neither CV or CC). |
| Dis Annunciator | Dis Annunciator | Indicates the power supply output is disabled. |