# Re: [TCML] voltage divider

```hi douglas
```
im hoping this ascii drawing works but if it doesnt i can draw up a pic n send link
```
basically you need resistors to divide the voltage down by a certain ratio
for example 5kv -> 5v you would need a ratio of 5000:5 or 1000:1

the resistors configred as follows

HV+ O-----[=R1=]-----(meter +)------[=R2=]------(meter -)---O HV-
for ac measurements HV+ = HV(hot) and HV- = HV(ground)

where R1+R2 : R1 = 1000:1
so the values can be any range of ohms/K/M ect
if we use 10K for R1 we will need 9990K for R2
reason for 9990K is because the 10K is included in both sides of the ratio
```
this is because the HV will be seen by all resistors (R1+R2) but the meter will only see the 10k portion (R1)
```
```
R2 can be made of any number of series resistors provided it adds up to 9990K ohms
```as an example you could have 9x1M + 9x100k + 9x10k (9000k + 900k + 90k)

this circuit is best with either a digital multimeter or a CRO/oscilliscope

the formulas are as follows

v1 = max range of the meter
```
v2 = required HV reading (try keeping it as multiple of 10 for ease of reading)
```
v2-v1
```
R2= ------ x R1 v1
```
if that didnt turn out well R2 = ( ( v1 - v2 ) / v1 ) x R1

hope this helps

--
Regards
BidSpec Electronics Engineering
Mob: 0404 259 733

douglas smith wrote:
```
```i hear you guys talking about  voltage dividers for measurement of kv.
is that for meters or scopes?
i was hoping someone had a good schematic so it can measure my high voltages
as right now my meter only goes to 750 a/c volts.
Ive never built one for  KV

```
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