diff --git a/firmware/led.c b/firmware/led.c
index 5468538..4ea1e0d 100644
--- a/firmware/led.c
+++ b/firmware/led.c
@@ -5,4 +5,4 @@ void led_init(void)
 {
 	TRISBbits.TRISB13 = 0;
 	PORTBbits.RB13 = 1;
-}
\ No newline at end of file
+}
diff --git a/firmware/scaling.c b/firmware/scaling.c
index c397657..7510ae9 100644
--- a/firmware/scaling.c
+++ b/firmware/scaling.c
@@ -7,7 +7,7 @@ uint16_t current_to_dac(float amps)
 	float tmp;
 	uint16_t dacc;
 
-	tmp = 32768 * (1 + amps / 20);
+	tmp = 536.0 / 1.0 * amps + 32524;
 	if (tmp < 0)
 		tmp = 0;
 	if (tmp > 65535)
@@ -17,10 +17,11 @@ uint16_t current_to_dac(float amps)
 	return dacc;
 }
 
+/* Convert the DAC output value to an effective current in the measuring loop */
 float dac_to_current(uint16_t dacv)
 {
 	float amps;
-	amps = dacv * (20.0 / 32768.0) - 20.0;
+	amps = ((float)dacv - 32524.0) * 1.0 / 536.0;
  	return amps;
 }
 
@@ -33,6 +34,6 @@ float adc12_to_current(int16_t picv)
 	if (picv > 2047)
 		picv = 2047;
 	
-	amps = (1024.0 - picv) / 3522.6;
+	amps = (picv - 1024.0) / 404.0;
 	return amps;
 }
diff --git a/firmware/zoom.c b/firmware/zoom.c
index add3eb2..37b5672 100644
--- a/firmware/zoom.c
+++ b/firmware/zoom.c
@@ -55,8 +55,14 @@ void TISR_HANDLER(5)
 	/* Convert ADC value to current */
 	i = adc12_to_current(v);
 
+#if 0
 	/* Adjust DAC to null this current to 0 */
 	dac_current -= i;
+#else
+	/* If this current exceeds +-1A, cancel it out at the DAC */
+	if (i < -1.0 || i > 1.0)
+		dac_current -= i;
+#endif
 
 	if (dac_current < dac_current_min)
 		dac_current = dac_current_min;
@@ -85,12 +91,15 @@ void send_to_pc(uint16_t adc, uint16_t dac)
 
 void degauss(void)
 {
+	return;
+#if 0
 	dac_write(65535); /* max */
 	msleep(25);
 	dac_write(0);     /* min */
 	msleep(25);
 	dac_write(32768); /* middle */
 	msleep(25);
+#endif
 }
 
 void run_debug(void)
@@ -214,6 +223,8 @@ int main(void)
 	led_init();
 
 	led_on();
+	/* debug */
+	TRISAbits.TRISA9 = 0;
 	/* Detect jumper on B10/B11 */
 	//TRISCbits.TRISC13 = 1;
 	//CNPU1bits.CN1PUE = 1;
@@ -232,9 +243,9 @@ int main(void)
 	/* If PGD is externally tied to ground, use MODE_1
 	   (Short ICD pins 3 and 4) */
 //	if (PORTCbits.RC13 == 0)
-		MODE_1();
+//		MODE_1();
 //	else
-//		MODE_2();
+		MODE_2();
 
 	for (;;)
 		continue;
diff --git a/firmware/zoom.mcw b/firmware/zoom.mcw
index fe7ca1c..09254d6 100644
Binary files a/firmware/zoom.mcw and b/firmware/zoom.mcw differ