# Why are measurents of primary and secondary voltages different to calculations?

#### gbtbtbt

Joined Mar 18, 2020
72
For a transformer, what might account for slightly lower measured secondary voltages.?

#### Ylli

Joined Nov 13, 2015
1,058
Leakage inductance, winding resistance if providing current.

#### gbtbtbt

Joined Mar 18, 2020
72
Thank you. Also is it possible to calculate a negative voltage, but not be measure a negative quantity on the voltmeter? If so, how is it possible?

#### MrChips

Joined Oct 2, 2009
26,477
We need more details. What voltages? 1mV? 1KV? Show us a circuit diagram.

#### gbtbtbt

Joined Mar 18, 2020
72
part 21 b figure 21-3.

For primary voltage terminal 2-6 and second voltage terminal 5-1, my secondary voltage was 206mV. We were using 1 Lab-Volt AC transformer module (EMS 8341).

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#### DickCappels

Joined Aug 21, 2008
8,806
Thank you. Also is it possible to calculate a negative voltage, but not be measure a negative quantity on the voltmeter? If so, how is it possible?
I am puzzled. What does "a negative quantity on a voltmeter" mean in a discussion of a circuit that only contains AC?

#### Alec_t

Joined Sep 17, 2013
12,887
Regardless of the buck/boost arrangement I am somewaht surprised and concerned at the unnecessarily high voltages being used for this academic exercise . Take care.
Are you sure you have your meter set to read AC volts?

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