Born almost 30 years ago and lived most of the time in a rough environment. It survived in my father’s workshop for so many years, thus for sure it’s good stuff.
Now I just use it as a backup multimeter, however it’s still working very well.
The first attached picture shows that it wasn’t treated very carefully all the time.
In consideration to the EEVBLog community I’ve taken apart the 8021B and took some pictures of it (attached bellow)
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)
It lacks the auto power off feature but the continuity test beeper is the fastest I ever seen in this type of multimeter.
The text on the bottom side of the PCB reveals the year of production (1981).
I’ve never calibrated this multimeter and I will show you why.
Measurements between the 8021B, a recent Fluke 115 and the 1905a multimeter from Thurlby Thandar Instruments (5½ digit resolution, ± 210000 counts):
| scale | 8021B | 115 | 1905a |
V DC | 2V | 1.896 | 1.895 | 1.8951 |
V DC | 20V | 7.00 | 7.00 | 7.0001 |
V DC | 200V | 64.2 | 64.16 | 64.220 |
V AC | 750V | 218 | 217.5 | 218.0 |
I DC | 2mA | 0.066 | 0.000* | 0.0656 |
I DC | 2mA | 1.962 | 0.002* | 1.9658 |
I DC | 20mA | 19.88 | 0.020* | 19.9511 |
I DC | 200mA | 23.4 | 0.023* | 23.320 |
I DC | 200mA | 198.7 | 0.198* | 198.358 |
I DC | 2000mA | 11 | 0.011* | 10.85 |
I DC | 2000mA | 1927 | 1.923* | 1927.92 |
*2A Scale
Resistence:
| scale | 8021B | 115 | 1905a |
shorted | 200 | 0.3 | 0.2 | 0.023 |
25.5 / 0.1% | 200 | 25.5 | 25.6 | 25.504 |
1k78 / 0.1% | 2k | 1k781 | 1k780 | 1k77940 |
10k / 0.1% | 20k | 10k00 | 10k00 | 9k9982 |
180k / 5% | 200k | 178k6 | 179k4 | 178k890 |
820k / 5% | 2M | 829k | 831k | 828k70 |
10M / 5% | 20M | 10M13 | 10M15 | 10M1005 |
Well the numbers speak for themselves. Not a top multimeter, still not ready for retirement
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
Best regards,
johnmx