HP 3478A: Difference between revisions
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Revision as of 04:05, 26 January 2025
- For more information, see this article's corresponding Wikipedia page: HP 3478A.
HP 3478A
| Preliminary Information | |
|---|---|
| Leak Risk | High |
| Batteries | Lithium 3V |
| Destructive Entry | No |
| Power Requirements | |
| Input Voltage | Fixed internal to mains |
| Power Connector | IEC C13/C14 Socket |
Known Issues
Rifa Capacitors
Causes
- Contains Rifa epoxy coated Paper capactitors
Solutions
- Remove or replace before using device
Battery
Causes
- Contains battery for holding calibration data
-
Solutions
- Replace battery while applying 3V DC to the parts it connects to. This will keep the calibration data while you remove the battery.
Disassembly Notes
There are different revisions of this multimeter that have different case designs.
Original Parts
Basic PCB Name
| RefDes | Qty | Capacitance | Voltage | Mount | Height | Lead Spacing | Type | Brand | Series |
|---|---|---|---|---|---|---|---|---|---|
| C765, C766 | 2 | 0.022 µF | 250V | Through Hole | 13mm | 15mm | Y Class Line Filter | Rifa | PME 271 Y |
| C720, C721 | 2 | 1000pF | 250V | Through Hole | 7mm | 10mm | Y Class Line Filter | Rifa | PME 271 Y |
Related Links
- Live Stream identifying caps: https://www.youtube.com/watch?v=lnEXFcK6s24