I just received a brand new Brymen 869s and I'm concerned it may be broken as it's giving a strange reading.
When measuring a 100k 0603 resistor which is soldered into a PCB (forming part of a larger circuit) I get the following readings:
- Direction away from J1: 3.29MΩ
- Direction towards J1: 2.02MΩ
I took some the same readings using a different multimeter, a Proster VC99 and got these readings:
- Direction away from J1: 100kΩ
- Direction towards J1: 8.66kΩ
At J1 there is a 10kHz 2Vpp sine wave.
Why would the Brymen show a value above 100kΩ whereas my cheapo Proster VC99 does not? Surely there's no way that the resistance can be larger than 100k in this circuit.
Here's the signal processing part of the circuit with the 100k resistor marked by the blue arrow. There are 4 similar circuits in the whole PCB since this is a 4 x voltage controlled amplifier circuit.