For the network of Fig. 7.55 , VGSQ is limited to negative values in the range 0 V to V P . If a meter is hooked up as shown in Fig. 7.55 , with the positive lead (normally red) to the gate and the negative lead (usually black) to the source, the resulting reading should have a negative sign and a magnitude of a few volts. Any other response should be considered suspicious and needs to be investigated.